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04-11-2013, 01:07 PM
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#1
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Junior Member
Join Date: Apr 2013
Posts: 3
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454 compression?
Can anyone tell me the acceptable range of compression for a 1998 454
V-8 L mounted in a 1998 Bounder 34 (61k miles). Thinking of buying and trying to avoid a nasty surprise later. Thanks in advance from Seattle. Mike
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04-11-2013, 01:18 PM
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#2
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Senior Member
Join Date: May 2004
Location: Auburn, CA, Havasu, AZ & Mulege, BCS
Posts: 5,385
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170-180 all around. Take all plugs out, remove coil wire, crank ea. cyl 4 or more turns, but do all the same. If you have any below this range, remove the gauge & put a squirt of 30wt oil in the cyl, wait 60 seconds, redo the test to see if cyl comes up. If no that cyl has a weak valve seat, if yes then weak rings.
__________________
Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
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04-11-2013, 04:28 PM
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#3
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Registered User
Join Date: Mar 2013
Posts: 1,919
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hold the throttle at wot also. this will allow for the maximum amount of air into the cylinder and should cause the PCM to enter a flood mode and stop the injector pulse.
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04-11-2013, 08:24 PM
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#4
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner
Join Date: Jun 2012
Location: SoCal
Posts: 15,749
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Quote:
Originally Posted by EngineerMike
170-180 all around. Take all plugs out, remove coil wire, crank ea. cyl 4 or more turns, but do all the same. If you have any below this range, remove the gauge & put a squirt of 30wt oil in the cyl, wait 60 seconds, redo the test to see if cyl comes up. If no that cyl has a weak valve seat, if yes then weak rings.
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__________________
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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04-12-2013, 10:03 AM
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#5
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Registered User
Triple E Owners Club Ford Super Duty Owner
Join Date: Apr 2013
Posts: 1,745
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Hi I am new to the site and just had to join after reading this thread.I agree with all of the above comments and would like to add a couple of things.
First off make sure that this unit has not been sitting over the winter and you decide to do it with the engine cold.If it has been sitting take it out on the road and run it. I have been a mechanic for 40 years and have seen some horrible repairs made to units that only required bring them up to temp.
I have seen the same thing with aircraft time and time again. Comes out of storage and the mechanic grabs the tester and wow he rubs his hand and has just sold you a repair job.
First rule ...Run up to temp. Than test
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04-12-2013, 10:26 AM
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#6
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,500
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Quote:
Originally Posted by narampa
Hi I am new to the site
First rule ...Run up to temp. Than test
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 narampa, sharing info is what the forums are all about.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Linear Mode
